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Commit d2b8105f authored by Rick Yiu's avatar Rick Yiu
Browse files

Add setSchedPolicyCgroup to AM service 

Add setSchedPolicyCgroup function to Activity Manager Service and aidl
of Activity Manager binder interface.

Bug: 139521784
Test: function works
Change-Id: I3e5796eefa1066f61dfcb1bd962ca6c548f8713a
parent d86f0879

core/java/android/app/IActivityManager.aidl

+1 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ interface IActivityManager { 
    void unregisterUidObserver(in IUidObserver observer);

    boolean isUidActive(int uid, String callingPackage);

    int getUidProcessState(int uid, in String callingPackage);

    boolean setSchedPolicyCgroup(int tid, int group);

    // =============== End of transactions used on native side as well ============================



    // Special low-level communication with activity manager.

services/core/java/com/android/server/am/ActivityManagerService.java

+47 −0
Original line number Diff line number Diff line
@@ -8765,6 +8765,53 @@ public class ActivityManagerService extends IActivityManager.Stub 
        return uidRecord != null && !uidRecord.setIdle;

    }













    /**













     * Change the sched policy cgroup of a thread.













     *













     * <p>It is intended to be used in jni call of {@link Process#setThreadPriority(int, int)}.













     * When a process is changing the priority of its threads, the sched policy of that













     * thread may need to be changed accordingly - if the priority is changed to below













     * or equal to {@link android.os.Process#THREAD_PRIORITY_BACKGROUND} or raising from it.













     * However, because of the limitation of sepolicy, the thread priority change will













     * fail for some processes. To solve it, we add this binder call in Activity Manager,













     * so that the jni call of {@link Process#setThreadPriority(int, int)} could use it.













     *













     * @param tid tid of the thread to be changed.













     * @param group The sched policy group to be changed to.













     *













     * @throws IllegalArgumentException if group is invalid.













     * @throws SecurityException if no permission.













     *













     * @return Returns {@code true} if the sched policy is changed successfully;













     *         {@code false} otherwise.













     */













    @Override













    public boolean setSchedPolicyCgroup(final int tid, final int group) {













        final int pid = Binder.getCallingPid();













        final int tgid = Process.getThreadGroupLeader(tid);













        final int pgroup = Process.getProcessGroup(pid);

























        // tid is not in the thread group of caller













        if (pid != tgid) {













            return false;













        }

























        // sched group is higher than its main process













        if (group > pgroup) {













            return false;













        }

























        try {













            Process.setThreadGroup(tid, group);













            return true;













        } catch (IllegalArgumentException e) {













            Slog.w(TAG, "Failed to set thread group, argument invalid:\n" + e);













        } catch (SecurityException e) {













            Slog.w(TAG, "Failed to set thread group, no permission:\n" + e);













        }













        return false;













    }



























    @Override















    public void setPersistentVrThread(int tid) {















        mActivityTaskManager.setPersistentVrThread(tid);